If the merging galaxies both have
star formation, the
galaxy merger
will likely cause a major
starburst region
(i.e, causes the
merging galaxies to become a
starburst galaxy with
a very high
star formation rate (SFR)).
The colliding interstellar medium (ISM)
is the cause of the starburst.
However, if the
golden mass ≅ 10**12 M_☉ is exceeded,
the merged galaxy
will quench
on a time scale of 2 Gyr???.
Galaxy quenching
of this sort starts in the inner region and progresses outward:
this is
inside-out galaxy quenching.
If the merged galaxy
does NOT
quench,
then its
ISM
can relax to a galactic disk
and the merged galaxy
could evolve into
spiral galaxy.
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